Frank Gray, the youngest captain of a boat on the C. & O. Canal had an unusual experience yesterday, at Williamsport while he was mooring his boat to Cushwa’s wharf to be unloaded, by a mule kicking him astern, knocking him into the water. Gray, being a good swimmer, although handicapped by an injured leg as the result of the mule’s kick, reached the shore. He got off the boat to adjust the towline, the tow boy being unable to manage it, and as he stepped behind the rear mule, it hauled off with a vicious kick and landed on Gray’s hip, which was badly bruised. Gray, who is from Baltimore, is only 17 years old, and has only been on the canal a few weeks.